Polyvinyl Butyral Manufacturer

The different kinds of Butvar resins have their properties laid out in Tables 1 to 5. These resins come in various molecular weights and viscosities. Butvar 76 and Butvar 79 resins have less hydroxyl content compared to other Butvar options, which gives them better solubility.   Generally, when you swap butyral groups for acetate groups, you get a polymer that repels water better and can handle heat more without deforming. This change also boosts the polymer's strength and how well it sticks to different surfaces. The strong sticking power of polyvinyl butyral resins comes from their terpolymer structure. Since each molecule has a choice of three different functional groups on its surface, the likelihood of adhesion to a wide range of substrates is significantly increased.   Although polyvinyl butyral resins (PVB) are generally thermoplastic and soluble in a number of solvents, they can be crosslinked by heat and small amounts of mineral acid.Crosslinking often happens through transacetalization, but it can also be due to more complicated processes, like reactions between acetate or hydroxyl groups on nearby chains.   In practice, crosslinking of polyvinyl butyrals is achieved by reaction with various thermosetting resins such as phenolic, epoxy, urea, dicyanate, and melamine resins. The availability of functional hydroxyl groups in Butvar resins for this type of condensation is an important factor in many applications. Including even a small amount of Butvar resin in thermosetting compositions will significantly improve the strength, flexibility, and adhesion of the cured coating.     Polyvinyl butyral films are known for their great resistance to various substances like aliphatic hydrocarbons and different kinds of oils, except for castor and gypsum oils. They tolerate strong bases, but are sensitive to strong acids. However, when used as components of cured coatings, their resistance to acids, solvents and other chemicals is greatly increased. Butyral withstands temperatures up to 200°F for long periods with little color change.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com  

  Production process of PVB:   Currently,Polyvinyl Butyral Resin (PVB) is mostly produced using an extrusion casting method. China has made some high-end PVB in the past, especially for the military, like in aircraft and military vehicles, but there hasn’t really been a large-scale market for it.   Since the technology behind PVB is a closely guarded trade secret, we don’t have a clear public description of the process. Still, we can get a rough idea from technical documents: 1. First, the raw materials are fed into different extruders by the feeding system, and the pellets are evenly plasticized and molten in the extruder by heating; 2. The molten body passes through the filter to remove impurities; 3. The melted material flows out through the adjustable discharge port after removing the impurities until it cools down and takes shape as a film. 4. The film passes through the automatic X-ray measurement system to see if the thickness meets the technical requirements; 5. After the film goes through processing, it gets treated on the surface, trimmed, wound automatically, and cut into shape. At this point, it's ready as a final product.   For PVB film, it’s important that the surface is flat. If the film is 0.76mm thick, any thickness variation should be no more than 0.02mm. When measuring in both vertical and horizontal directions over a range of 50mm, the error should be under 0.006mm. Also, the moisture content has to stay below 0.3%, and the natural rating should be under 12%.     The technical difficulty of PVB production：   In terms of process, the ratio of polyvinyl butyral resin and plasticizer is one of the key points to determine the quality. In addition, since PVB has high requirements for humidity, special treatment is required during slitting, packaging, storage, and transportation;PVB needs specific humidity levels, so we have to be careful with slitting, packaging, storing, and transporting it. Plus, to make high-quality PVB, we need good resin, which means new projects will need extra resin production areas. This adds some new challenges for managing the process.   For PVB (such as Butvar B-74) in the solar industry, there are extra demands for resistivity and temperature compared to what’s needed for regular car glass or curtain walls. Usually, the resistance furnace requires more than 1000 ohms/cm2; the temperature must be lower than the tolerance temperature of the film to avoid damaging the reaction layer.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

In recent years, with the accelerated pace of urbanization in my country and the continuous growth of automobile sales, there has been a strong demand for PVB laminated glass. At the same time, with the development of technology, Polyvinyl Butyral Resin (PVB) Film has been researched and developed, and the application market has been further developed. In this development process, we must not only pay attention to new technological innovation, but also overcome the technical difficulties in the process of PVB waste collection and recycling, so as to achieve the environmental friendliness and maximize the economic benefits of the PVB industry. At present, the recycling of PVB resin mainly includes physical recycling method, chemical recycling method and energy recovery method.     Physical recycling is to put the discarded PVB through a series of physical treatment processes, such as separation, purification, cleaning, etc., and at the same time, add certain additives as required for reuse. This method can effectively utilize PVB materials and greatly reduce environmental pollution. For example, the PVB solid waste and scraps discarded in the market are recycled, and after sorting, cleaning, drying, and crushing processes, plasticizers, tougheners, three-salt stabilizers and other additives are added, and waterproof membranes for construction are produced through high-speed mixing, mastication, tableting and other processes. Through experimental research, it has been found that the waterproof membrane has good mechanical properties, convenient processing, and a wide operating temperature range, and has broad market prospects in the construction field.   The chemical recycling method uses light, heat, radiation, and chemical reagents to degrade PVB polymer into low-molecular single or hydrocarbon substances. At the same time, the cracked raw materials can be reused. Common cracking methods include hydrolysis, alcoholysis, thermal cracking, hydrocracking, catalytic cracking, etc. However, the current technology of this deep chemical recovery method is not very mature, the technology cost is high, and the economic benefits are low. Currently, the most commonly used method is to process waste PVB to obtain pure polymer resins and additives. Supercritical separation technology is used to separate the additives and resin in colorless PVB.   Energy recovery is the process of extracting energy from waste plastic, typically used as fuel or to generate steam to generate electricity. Because PVB (PVB B-03TX& PVB B-03HX) polymer contains a large amount of hydrocarbons, it is flammable. Although the energy recovery method is one of the methods for recycling PVB waste, it is not commonly used due to its high cost.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com

Polyvinyl Butyral (PVB) is a versatile and widely-used thermoplastic resin known for its exceptional properties. It is made by the condensation polymerization of polyvinyl alcohol (PVA) with butyraldehyde. PVB offers unique advantages such as transparency, excellent adhesion, impact resistance, and UV stability, making it indispensable in numerous industries.   One of the key characteristics of PVB is its high transparency. PVB films have excellent optical clarity, allowing light to pass through without distortion. This property makes PVB a popular choice for safety glass applications, such as laminated glass used in automotive windshields and architectural windows. The inherent toughness of PVB also enhances the safety of laminated glass by preventing it from shattering upon impact.   PVB exhibits remarkable adhesion to various substrates, including glass, metals, and plastics. This adhesive property makes it an ideal interlayer material for laminated safety glass. The strong bond created by PVB interlayers holds the glass together even when it breaks, thus providing enhanced protection against personal injury and property damage. The adhesion of PVB also makes it suitable for laminating other materials, such as textiles, metals, and electronic components.   When used as an interlayer in laminated glass, PVB significantly improves impact resistance. The tough and flexible nature of PVB helps absorb and distribute energy upon impact, minimizing the risk of breakage. This impact-resistant property finds applications in safety glass for automotive windshields, architectural structures, and bullet-resistant glass.   PVB exhibits excellent resistance to ultraviolet (UV) radiation. It acts as a UV stabilizer, protecting the underlying materials from degradation caused by prolonged exposure to sunlight. This makes PVB an ideal choice for outdoor applications, such as solar panels and architectural glazing, where UV resistance is crucial.   PVB (Butvar B-74 & PVB B-04HX) can be customized and modified to suit specific application requirements. By altering the molecular weight and modifying the plasticizers, various grades of PVB with different characteristics can be produced. This versatility enables manufacturers to tailor PVB properties such as viscosity, glass transition temperature, and adhesion strength to meet the specific needs of different industries, including automotive, construction, and electronics.   Website: www.elephchem.com Whatsapp: (+)86 13851435272 E-mail: admin@elephchem.com